USUALY THIS IS CAUSED BY TO LOW OF AIR PRESSURE(NEED AT LEAST90-100PSI)OR NAILING INTO SEASONED HARD WOOD SUCH AS OAK,OR THE WRONG DEGREE PITCH OF THE COLLIATED NAILSHOPE THIS HELP'S.PLEASE RATE THIS .

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could be couple problems first make sure using the right type of nails I.E. collation and degree of angle. Next look for jammed nail in the nose area and then look at the nose condition for excessive wear and lastly look at the tip of the driver for wear and not being square so it drives the nail straight.

The F28WW takes 28Deg nails that are collated with wire, so your nails won't work in that gun. The N80SB is also a 28Deg nailer so your 30 Deg nails won't work in that gun either.
Sorry about the bad news but it looks like your going to have to spring for new nails

It is not the best brand but, it should work for a few projects. Increase the air flow and make sure it is lubercated. It is designed to shoot nails into soft wood, like pine. It could be a o-ring blown or damaged, which is easy and inexpensive to repair. Good luck. Phil.